Terminal Channel Identification Format Switching for Uplink Overhead Reduction
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Solution Overview
Problem
In communication systems, the amount of information required to notify channel quality and identification information to the base station increases significantly when selecting multiple channels, leading to inefficiencies in data transmission.
Innovation Solution
A communication system where the terminal apparatus selects and notifies the base station of channel quality information and identification information using a representation format that switches between channel numbers and binary bit sequences based on the number of selected channels, reducing the overall amount of notification data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel quality information and identification information for multiple selected channels are transmitted to the base station, then the base station can perform accurate downlink channel assignment and adaptive modulation, but the amount of notification information transmitted in the uplink enormously increases
Solution Approach 1:
The patent segments the channel identification information transmission by selecting only the most significant channels (top M channels with best reception quality) rather than transmitting all channel information. This segmentation approach maintains reliable downlink channel assignment for the most important channels while significantly reducing the total amount of notification information transmitted in the uplink.
Solution Approach 2:
The patent dynamically adjusts the number of channels M to be reported based on system conditions. The terminal apparatus determines M based on reception quality measurements and base station requirements, allowing flexible adaptation between transmission reliability and information quantity. This dynamic adjustment enables optimal balance between maintaining accurate channel assignment and reducing uplink overhead.
2Device complexity
If a fixed representation format is used for channel identification information, then the system is simple to implement, but the amount of information increases when the number of selected channels increases
Solution Approach 1:
The patent employs a dynamic representation format that changes based on the number of selected channels M. When M is small, the system uses a compact format; when M is large, it switches to an expanded format. This dynamic format adjustment maintains implementation simplicity while optimizing information quantity according to actual channel selection needs.
Solution Approach 2:
The patent changes the representation format parameter based on the value of M (number of selected channels). The system transitions between different encoding schemes or bit allocation methods depending on whether M is small or large, thereby optimizing the balance between format complexity and information quantity for different operational scenarios.
Data Source
AI summary
Reception quality measurement results of respective channels which have been outputted from a reception quality measuring section 308 are inputted to a selected channel determining section 341 and a channel quality information generating section 342. The number of selected channels M which has been previously defined or the number of selected channels M which has been outputted from a control information obtaining section 314 is inputted to the selected channel determining section 341 and a channel identification information generating section 343. The channel identification information generating section 343 selects one of a first representation format for representation with M channel numbers indicating the respective selected channels, and a second representation format for representation representing whether or not each of all the channels is included in the selected channels, based on the number of selected channels M, and uses the selected representation format to generate and output channel identification information.